Nice 20MHz output buffer, and other circuits

I came across a nice 20MHz function generator output buffer, made of easy-to-find transistors. It is here. The website is by Dick Cappel, who seems to have created a lot of interesting designs, and is worth a nose around. .

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/nice-20mhz-output-buffer-circuits-2017-11/